A new way to browse your images! You can now quickly Peek into the directory without opening the Thumbnails, just move your mouse near the top line. If you then press and drag the mouse, you can perform fast skimming. Mouse wheel or two finger scroll (OSX) will also do the trick.
Drag and Drop [user request]
It is now possible to Move or Copy images from or into the current directory by Dragging and Dropping them from/into the Thumbnails. This will act much like the system's files browser (Explorer, Finder, Nautilus, etc).